Line appears under image in VSE
I use blener 2.7a. I had the same problem. but only if I use "Image Crop" function and sRGB as "Input Color". The thin line you referring to is 2 pixels in height, one pixel above bottom, so the last line of pixel remains sound, right? Checking "Convert Float" under "Filter" resolved the problem for the above settings on my system! Although I do not really know, what it does. Hope this helps...
Besides, my input-file is MTS from Lumix GH2.